1999 to 2006 Chevrolet and GMC C/K 1500 1/2 Ton trucks with a 4.8L or 5.3L engine using a single flanged catalytic converter, fits 2 and 4 wheel drive models with a Standard Cab and short bed configuration on a 119 inch wheelbase.

For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster cat-back exhaust system provides. D.O.R./D.O.S. systems are the perfect choice, and include exit pipes for both Dual Out Rear and Dual Out side configurations so that you can choose the one that fits your style. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.

Mandrel bent 16 gauge aluminized tubing

Moderate to aggressive exterior exhaust tone

Includes hangers and hardware for easy installation

Dyno tuned for maximum performance

Made in the USA

Premium Flowmaster quality

Application Revision:

Chevy Silverado 1500 LS 1999-07

Flowmaster Cat-Back Exhaust Systems are designed with the latest technology to provide the best possible performance from a Flowmaster Muffler. They improve acceleration, passing power, and fuel mileage. Every cat-back exhaust is individually engineered and dyno-tested for each application. All tubing is mandrel bent for the best possible exhaust gas flow and fabricated from 409S stainless or aluminized steel for corrosion resistance. Made in the USA.

Wanna let folks know you've got a Flowmaster system under your vehicle when you open it up, but don't want a lot of interior resonance? Flowmaster's Force II systems are designed to provide plenty of "Flowmaster Sound" under acceleration, but lower levels while cruising.

Dual Rear Exit Exhaust Systems (DOR)The Flowmaster DOR systems are designed for the person who wants that custom
look of a dual exhaust on a late model vehicle that came with a factory
single exhaust. These cat back systems feature mandrel bent 16 gauge tubing, either weld-on or flanged inlet pipe/pipes, specially tuned
muffler, clamps, hangers and stainless steel exhaust tips for that aggressive
look and sound of a dual exhaust system.

Dual Side Exit Exhaust Systems (DOS)The Flowmaster DOS systems are designed for the person who wants that custom
look of a dual exhaust on a late model vehicle that came with a factory single
exhaust. These systems feature mandrel bent 16 gauge tubing, either weld-on or flanged inlet pipe/pipes, specially tuned muffler,
clamps, hangers and stainless steel exhaust tips for that aggressive look and
sound of a dual exhaust system. Recommended for towing applications.

Single Side Exit Exhaust Systems (SOS)The Flowmaster SOS system is for the person who wants a subdued, but custom look,
with all the benefits of a Flowmaster exhaust system. These cat back systems feature
mandrel bent 16 gauge tubing, either weld-on or flanged
inlet pipe/pipes, specially tuned muffler, clamps, hangers and stainless steel
exhaust tip exiting in the factory location out the side behind the rear tire
of the vehicle.

Single Rear Exit Exhaust Systems (SOR)The Flowmaster SOR system is for the person who wants a subdued but custom
look, with all the benefits of a Flowmaster exhaust system. These systems
feature mandrel bent 16 gauge tubing, either weld-on or
flanged inlet pipe/pipes, specially tuned muffler, clamps, hangers and stainless
steel exhaust tip exiting in the factory location either under the bumper, or
through the valance at the rear of the vehicle.

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